Gas Sensor Self-Testing via Electrolytic Test Gas Generation
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Solution Overview
Problem
Existing gas measuring arrangements for combustion systems face challenges in independently and efficiently checking the functionality of gas sensors, which can lead to incorrect combustion control and safety issues due to sensor aging or faults, requiring time-consuming and costly manual testing.
Innovation Solution
A gas measuring arrangement with a built-in test gas supply unit that generates and delivers test gases with variable compositions, allowing for automatic and independent functional checks and calibration of gas sensors, regardless of their installation environment, using components like electrolytic cells and mass flow controllers to produce and mix test gases such as H2 and O2.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual testing of gas sensors is performed, then sensor functionality can be checked, but the process is time-consuming and costly
Solution Approach 1:
The gas sensor device performs self-testing by generating its own test gases internally using an electrolytic cell that produces hydrogen and oxygen, eliminating the need for external test gas cylinders or manual intervention. The device autonomously flushes its sensor elements with generated test gases to verify functionality.
Solution Approach 2:
The patent replaces mechanical test gas delivery systems (cylinders, valves, pumps) with an electrochemical generation system. An electrolytic cell uses electrical energy to decompose water into hydrogen and oxygen gases, which are then delivered to sensor elements through electronic control rather than mechanical handling.
2Measurement precision
If external test gas supply is used, then sensor calibration is possible, but the system becomes more complex and costly
Solution Approach 1:
The electrolytic cell serves multiple functions: it generates test gases for functional testing, provides calibration gases for sensor adjustment, and can operate in different modes (functional test mode with both H2 and O2, calibration mode with pure H2 or pure O2). This multi-functionality eliminates the need for separate test gas cylinders and delivery systems.
Solution Approach 2:
The patent combines the test gas generation, storage, and delivery functions into a single integrated electrolytic cell system. The cell generates gases on-demand directly at the sensor device, merging what would traditionally be separate external components (gas cylinders, regulators, flow meters, delivery tubing) into one compact unit.
3Ease of operation
If gas sensors are tested in-situ, then installation is maintained, but sensor aging and faults may go undetected
Solution Approach 1:
The system performs preliminary functional tests using generated test gases before actual combustion operations. By flushing sensor elements with known concentrations of H2 and O2, the system proactively detects sensor degradation or faults before they affect combustion control accuracy, ensuring reliability while maintaining in-situ operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables efficient, automatic, and cost-effective functional checks and calibration of gas sensors, reducing the risk of incorrect combustion control and improving safety by allowing for stand-alone testing and calibration without removing the sensor from the system.
Implementation Method 1
a generation unit (27) for generating a first partial gas stream comprising a first gas component (H2) and a second partial gas stream comprising a second gas component (O2)
Implementation Method 2
using components like electrolytic cells and mass flow controllers to produce and mix test gases such as H2 and O2
Implementation Method 3
a sensitive material selectively and reversibly converts a chemical or physical quantity, such as the concentration of a substance or mixture, into an electrical signal that depends on the concentration of the substance or mixture being measured
Data Source
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AI summary
The invention relates to a gas measuring arrangement (1) comprising: - a gas sensor device (2) containing a gas sensor element (3) with a measuring zone, - a measuring device (4) containing a measurement signal processing and provision unit, characterized in that the measuring device (4) additionally includes a test gas provision unit (6) for the formation of a test gas (13) of a predetermined and/or variable test gas composition, and that the gas measuring arrangement (1) comprises a gas supply means (7) to supply the test gas (13) from the test gas provision unit (6) in the measuring device (4) to the gas sensor element (3).